We pick j.root-servers.net, one of the 13 root servers (1), and ask it about uk.fm and learn that fm is delegated to six name servers (2), so we ask tld5.ultradns.info where we learn that uk.fm is delegated to two name servers, including ns28.webmasters.com (3), so we ask that one and get the following answer:
Uk.fm is a domain controlled by two domain name servers at webmasters.com. Both are on different IP networks. Incoming mail for uk.fm is handled by one mail server at .. We are missing the IP:s of one server: .. Uk.fm has one IP number (208.64.137.24), but the reverse is ?.
The two name servers ns28 and ns5.webmasters.com together
All of the six domains that use the two name servers ns28 and ns5.webmasters.com together, hereafter referred to as "name server group 1", point only to the IP number 208.64.137.24. Worth noting is that all of the host names that point only to the IP number 208.64.137.24 use name server group 1.
The IP number 208.64.137.24 only
All of the six host names that point only to the IP number 208.64.137.24 use name server group 1. Worth noting is that all of the domains that use name server group 1 point only to the IP number 208.64.137.24.
The two name servers ns28 and ns29.webmasters.com together